Brachioradialis
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2008-07-02T12:05:57Z
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{{Muscle infobox |
Name = Brachioradial muscle |
Latin = musculus brachioradialis |
GraySubject = 125 |
GrayPage = 451 |
Width = 125 |
Image = Brachioradialis.png |
Caption = Anterior view of muscles of the left forearm with Brachioradialis shown in blue. |
Image2 = Gray417_color.PNG |
Caption2 = Cross-section through the middle of the forearm. (Brachioradialis labeled at center left, sixth from the top.) |
Origin = [[Lateral supracondylar ridge]] of the [[humerus]] |
Insertion = Distal [[radius]] ([[Radial styloid process]])|
Blood = [[radial recurrent artery]] |
Nerve = [[radial nerve]] |
Action = [[Flexion]] of [[forearm]] |
MeshName = |
MeshNumber = |
DorlandsPre = m_22 |
DorlandsSuf = 12548506 |
}}
'''Brachioradialis''' is a [[muscle]] of the [[forearm]] that acts to flex the forearm at the [[elbow]]. It is also capable of both [[pronation]] and [[supination]], depending on the position of the forearm. It is attached to the distal styloid process of the [[radius (bone)|radius]] and the [[lateral supracondylar ridge]] of the [[humerus]].
==Action==
Brachioradialis flexes the forearm at the elbow. When the forearm is pronated, the brachioradialis tends to supinate as it flexes. In a supinated position, it tends to pronate as it flexes.
The brachioradialis is a stronger elbow flexor when the forearm is in a midposition between supination and pronation at the [[radioulnar joint]]. When pronated, the brachioradialis is more active during elbow flexion since the [[biceps brachii muscle|biceps brachii]] is in a mechanical disadvantage.
==Innervation==
Despite the bulk of the muscle body being visible from the anterior aspect of the forearm, the brachioradialis is a posterior compartment muscle and consequently is innervated by the [[radial nerve]]. Of the muscles that receive innervation from the radial nerve, it is one of only four that receive input directly from the radial nerve. The other three are the [[triceps brachii muscle|triceps]], [[anconeus muscle|anconeus]], and [[extensor carpi radialis longus]]. (All other posterior compartment muscles that receive radial innervation are supplied by the [[deep branch of the radial nerve]].)
==Additional images==
<gallery perrow="3">
Image:Gray207.png|Left humerus. Anterior view.
Image:Gray213.png|Bones of left forearm. Anterior aspect.
Image:Gray414.png|Front of the left forearm. Superficial muscles.
Image:Gray418.png|Posterior surface of the forearm. Superficial muscles.
Image:Gray525.png|The brachial artery.
Image:Gray527.png|The radial and ulnar arteries.
Image:Gray528.png|Ulnar and radial arteries. Deep view.
Image:Nerves_of_the_left_upper_extremity.gif|Nerves of the left upper extremity.
</gallery>
==External links==
* {{MuscleLoyola|brds}}
* {{MuscleUWash|brachioradialis}}
* {{SUNYAnatomyFigs|07|01|09}} - "Transverse section through the left arm just proximal to the elbow."
* {{SUNYAnatomyFigs|07|03|07}} - "Superficial muscles of the anterior (flexor) compartment of the left forearm."
* {{SUNYAnatomyFigs|09|02|02}} - "Superficial muscles of the posterior (extensor) compartment of the left forearm."
* {{NormanAnatomy|lesson5musofpostforearm}}
{{Muscles of upper limb}}
[[Category:Muscles of the upper limb]]
[[ar:عضلة عضدية كعبرية]]
[[ca:Múscul braquioradial]]
[[de:Musculus brachioradialis]]
[[es:Supinador largo]]
[[fr:Muscle brachioradial]]
[[he:שריר הזרוע והחישור]]
[[hr:Nadlaktičnopalčani mišić]]
[[hu:Musculus brachioradialis]]
[[nl:Musculus brachioradialis]]
[[ja:腕橈骨筋]]
[[pl:Mięsień ramienno-promieniowy]]
[[pt:Músculo braquiorradial]]
[[sl:Brahioradialna mišica]]
[[sv:Brachioradialis]]
[[th:กล้ามเนื้อบราคิโอเรเดียลิส]]